Modbus is a lightweight Model Context Protocol (MCP) server that bridges the gap between Large Language Model (LLM) agents and Modbus-enabled devices. It enables AI-driven workflows within Building Automation Systems (BAS) and Industrial Control Systems (ICS) by providing a secure and standardized interface for monitoring real-time sensor data, actuating devices, and orchestrating complex automation tasks. Leveraging FastMCP 2.0, Modbus streamlines Modbus read and write operations with minimal boilerplate, providing a clean, Pythonic interface for interacting with Modbus devices.